<template>
    <div class="setPublic-thereErr">
        <input type="text" class="setPublic-thereErrInput" maxlength="4" v-model="code">
        <canvas id="twoImg" width="100" height="40" class="twoImg" @click="change"></canvas>
    </div>
</template>
<script>
    function randomNum(min,max){
        return Math.floor(Math.random()*(max-min)+min);
    }
    function randomColor(min,max){
        var _r = randomNum(min,max);
        var _g = randomNum(min,max);
        var _b = randomNum(min,max);
        return "rgb("+_r+","+_g+","+_b+")";
    }
    function drawPic(id){
        var $canvas = document.getElementById(id);
        var _str = "0123456789";
        var _picTxt = "";
        var _num = 4;
        var _width = $canvas.width;
        var _height = $canvas.height;
        var ctx = $canvas.getContext("2d");
        ctx.textBaseline = "bottom";
        ctx.fillStyle = randomColor(180,240);
        ctx.fillRect(0,0,_width,_height);
        for(var i=0; i<_num; i++){
            var x = (_width-10)/_num*i+10;
            var y = randomNum(_height/2,_height);
            var deg = randomNum(-45,45);
            var txt = _str[randomNum(0,_str.length)];
            _picTxt += txt;
            ctx.fillStyle = randomColor(10,100);
            ctx.font = randomNum(16,40)+"px SimHei";
            ctx.translate(x,y);
            ctx.rotate(deg*Math.PI/180);
            ctx.fillText(txt, 0,0);
            ctx.rotate(-deg*Math.PI/180);
            ctx.translate(-x,-y);
        }
        for(var i=0; i<_num; i++){
            ctx.strokeStyle = randomColor(90,180);
            ctx.beginPath();
            ctx.moveTo(randomNum(0,_width), randomNum(0,_height));
            ctx.lineTo(randomNum(0,_width), randomNum(0,_height));
            ctx.stroke();
        }
        for(var i=0; i<_num*10; i++){
            ctx.fillStyle = randomColor(0,255);
            ctx.beginPath();
            ctx.arc(randomNum(0,_width),randomNum(0,_height), 1, 0, 2*Math.PI);
            ctx.fill();
        }
        return _picTxt;
    }
    export default{
        data(){
            return{
                code:'',
                lscode:''
            }
        },
        props:['cp'],
        watch:{
            cp:function () {
                this.change();
            },
            code:function () {
                let dsa='';
                if(this.code==this.lscode){
                    dsa=1;
                }else if(this.code==''){
                    dsa=2;
                }else if(this.code!=this.lscode){
                    dsa=0;
                }
                this.$emit('thereCode',dsa)
            }
        },
        mounted:function () {
            setTimeout(()=>{this.change()},10)
        },
        methods:{
            change:function () {
                this.lscode=drawPic('twoImg');
            }
        }
    }
</script>